Physics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002e%26psl.199..493i&link_type=abstract
Earth and Planetary Science Letters, Volume 199, Issue 3-4, p. 493-501.
Physics
Scientific paper
Deformation and P-T conditions of the Cretaceous Ryoke-Sambagawa metamorphic belts have been analyzed based on recent numerical modeling of plastic flow at convergent plate boundaries. The analyses suggest that a three-dimensional corner flow in the forearc wedge associated with subduction with moderate obliquity (more than 45° for the angle between the subduction direction and the trench) can explain the observed prolate strain: a large strain (more than 10), with the angle of 10-30° between the elongation axis and the strike of the regional metamorphic belts, is attributed to a combination of (1) stretching in the subduction direction above the subducting plate, and (2) stretching and rotation towards the along-trench direction at the wedge corner. Therefore, the observed large strain is not a consequence of a significant lateral displacement of the two plates. Based on the analyses, the contemporaneous Ryoke (low-P/T)-Sambagawa (high-P/T) metamorphic belts are suggested to have been formed within a single trench-forearc system by a series of events, not by accidental amalgamation of two distinct terranes. The contrasting low- and high-P/T metamorphic conditions are demonstrated to be simultaneously achieved in the forearc region during the dynamic flow associated with ridge subduction, where a large temperature gradient is produced.
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